Three-microphone probe bias errors for acoustic intensity and specific acoustic impedance

摘要

In acoustic intensity estimation, adding a microphone at the probe center removes errors associated with pressure averaging. Analytical bias errors are presented for a one-dimensional, three- microphone probe for active intensity, reactive intensity, and specific acoustic impedance in a monopole field. Traditional estimation is compared with the Phase and Amplitude Gradient Estimator (PAGE) method; the PAGE method shows an increased bandwidth for all three quantities. The two- and three-microphone methods are compared experimentally, showing reduced bias errors with three- microphone PAGE for active and reactive intensity, whereas using two microphones is preferred for specific acoustic impedance. (C) 2018 Acoustical Society of America